Construction
The single pole, double throw construction instantly switches loads from one terminal to the other. This is accomplished through the temperature sensitive, actuating element — a snap–action, bimetal disc. This in turn activates a snap–acting switching mechanism. As the temperature reaches a predetermined point, the disc snaps to its reverse curvature, producing the crisp, positive switching action inherent to Klixon thermostats. This feature assures reliable, consistent operating temperatures over long cycle life with a minimum of electromagnetic interference.

The Klixon 5BT series thermostat
is a high reliability, hermetically sealed thermal switch. The single pole, double throw
design allows versatility and economy in providing two functions within the same device.
Typically these Klixon switches are used to control and indicate at a preset temperature.
One pole can control a cooling fan and the other pole can indicate impending danger.